• Korean Journal of Pharmacognosy
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• v.34 no.1 s.132
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• pp.86-90
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• 2003

For the determination of inhibiting cytochrome P450(CYP)3A4 activity, an improvement HPLC method was established by using a new internal standard and solvent system. Moreover, CYP3A4 amount for a optimum reaction of enzyme was determined by a comparative study with a variety concentration of enzyme. Using a established method, inhibitory effect of CYP3A4 that is drug metabolizing enzyme Investigated on EtOAc extracts of 5-class spices. As a result of experiment, EtOAc extract of white pepper (Piper nigrum L.) showed strong inhibitory activity. On a continuous experiment, the fraction 2, 4 and 5 of while pepper extract showed remarkable inhibitory activity. Pipeline, a main constituent of pepper was not included in these fraction. It is suggested that major compounds for the inhibitory activity of white pepper may be other ingredient that is not piperine.

• 한국신재생에너지학회:학술대회논문집
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• 2006.11a
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• pp.537-540
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• 2006

국제 유가의 상승으로 대체 에너지개발의 필요성이 대두되고 있는 지금 수송연료인 디젤의 대체 원료로 바이오디젤이 부각되었다. 차세대 대체연료인 바이오디젤의 합성 원료의 국산화로 수급의 안정성과 농가소득향상을 위해서 국내산 유채 착유기의 개발 및 유지의 함량을 측정하고 바이디젤로서의 적용가능성을 살펴보며 유박에서의 유지 추출 Biomass활용방안을 도출한다 국내산 유채 착유기 및 착유기술 평가를 통해 중소형 유채 착유기의 제작과 기본 조건을 도출을 위해 유채 착유실험을 진행하였다. 유채유의 착유온도에 따른 물성변화와 산가, 수분, 착유율의 변화와 영향을 확인하기 위해 roaster의 온도를 고온과 저온으로 나누어 착유하여 각각의 물성 실험과 산가, 수분, 착유율을 측정 비교하였다. 유채유는 저온보다 고온에서 착유량이 높으나 많은 검질과 높은 산가로 인해 바이오디젤 합성과정에 많은 어려움을 나타내었다. 유채의 유박을 바이오디젤과 에탄올로 각각 Extraction.한 결과 바이오디젤보다는 에탄올이 적용 가능성이 높음을 확인하였다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2011.07a
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• pp.122-125
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• 2011

In real environment, background noise exists everywhere and degrades the performance of system. To reduce this distortion, a speech enhancement algorithm can be very useful and variety methods have been proposed. In this paper, we propose a postfilter to improve the performance of optimally modified log-spectral amplitude (OM-LSA) estimator. Proposed algorithm uses the formant postfilter to minimize perceptual distortion caused by background noise. We adjust an emphasizing parameter which is varied by spectral flatness and first reflection coefficient. The performance of the proposed algorithm is evaluated by measuring the log-spectral distance (LSD) and the perceptual evaluation of speech quality (PESQ) score. The test results show the improvement of proposed algorithm compared to conventional OM-LSA.

• Korean Journal of Human Ecology
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• v.13 no.6
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• pp.1047-1053
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• 2004

The purpose of this study is to assess students' attitude and satisfaction of university foodservices. We conducted a survey for this study using questionnaires with 400 university students. A total of 344 students answered with a usable response rate of 86.0%. We performed a statistical data analysis using SPSS program for $X^{2}-test$ and t-test. Students visited university foodservices more frequently for lunch than for breakfast or dinner. Students' food choice depended on taste of food. The main reasons for using university cafeteria included 'a low price' and 'economy of time'. The prior complaint factor on university foodservices was 'taste of food'. Students were more satisfied with a price than other factors. They marked 'a variety of menu' as the least satisfied. The matters, such as 'more delicious food' and 'more various menu' were pointed out for improvement. In conclusion, developing tastier food and diversifying a menu are required to enhance the quality of university foodservices.

• Journal of Korea Multimedia Society
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• v.14 no.9
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• pp.1202-1209
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• 2011

Neuro feedback training using ElectroEncephalo Grams (EEGs) is commonly utilized in the treatment of Alzheimer's disease, and Attention Deficit Hyperactivity Disorder (ADHD). Recently, BCI (Brain-computer Interface) contents have developed, not for the purpose of treatment, but for concentration improvement or brain relaxation training. However, as each user has different wave forms, it is hard to develop contents controlled by such different wave. Therefore, an EEG process that allows the ability to transform the variety of wave forms into one standard signal and use it without taking a user's characteristic of EEG into account, is required. In this paper, a framework that can reduce users' characteristics by normalizing and converting measured EEGs is proposed for contents. This framework also contains the process that controls different brainwave measuring devices. In experiment a handling process applying the proposed framework to the developed BCI contents is introduced.

• KIEAE Journal
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• v.16 no.1
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• pp.95-101
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• 2016

This study aims to analyze the satisfaction targeted community space for public rental housing tenants a real community space. and community space is analyzed only through the factor analysis of the effects of satisfaction, multiple regression analysis etc. As a result, the space community and public rental housing will only affect the satisfaction, factors affecting such analysis was 'common space', 'exercise place', 'resting place'. Thus, a variety of political and institutional efforts and practical research for interactive spatial planning public rental housing estates satisfaction for the improvement and community activation moving away from passive concept of the one-way ever to supply that community space in the past, provider centers and considering the tenant characteristics is required.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.36 no.6
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• pp.390-395
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• 1987

There is a variety not only of research topics but also of research techniques in electric power problems. It is well known that a significant increase in the rate of convergence can be obtained for the Gauss-Seidel method using the bus admittance matrix by applying acceleration factors determined empirically. The acceleration factor is calculated theoretically by using the bus voltage sensitivity (buses voltage interact each other) in this paper. It is observed that the proposed method using calculated acceleration factor gives better results than those of the method using calculated acceleration factor gives better results than those of the method using empirical one.

• Proceedings of the KSR Conference
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• 2004.06a
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• pp.732-737
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• 2004

TTX(Tilting Train Express), which has improved traveling performance on curved track, is being designed in cope with future railway circumstance. Nowadays, in the world, many efforts are focussed on railway safety. Especially, a variety of researches on train crashworthiness have been conducted. As a part of these efforts, some equipments on TTX are designed to reduce fatalities and casualties in crash accidents. This paper introduces impact energy absorbtion characteristics on the initial design of the front end structure. Some comments are made briefly for improvement of initial structural design and future following researches.

• Rubber Technology
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• v.12 no.1
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• pp.1-7
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• 2011

Nanotechnology is the fast becoming key technology of the $21^{st}$ century. Due to its fascinating size-dependent properties, it has gained significant important in various sectors. Myths are being formed on the proverbal nanotechnology market, but the reality is the nanotechnology is not a market but a value chain. The chain comprises of - nanomaterials (nanoparticles) and nanointermediates (coatings, compounds, smart fabrics). Elastomer based nanocomposites reinforced with low volume fraction of nanofillers is the first generation nanotechnology products and it has attracted great interest due to their fascinating properties. The incorporation of nanofillers such as nanolayered silicates, carbon nanotubes, nanofibers, metal oxides or silica nanoparticles into elastomers improves significantly their mechanical, thermal, barrier properties, flame retardency etc., Extremely small particle size, high aspect ratio and large interface area yield an excellent improvement of the properties in a wide variety of the materials. Uniform dispersion of the nanofillers is a general prerequisite for achieving desired properties. In this paper, current developments in the area of elastomer based nanocomposites reinforced with layered silicate and carbon nanotube fillers are highlighted.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2006.05a
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• pp.191-194
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• 2006

Recently the quality improvement of the steel cord product is demanded by the tire market. After wire drawing process, produced residual stresses have a harmful effect on the durability of the wire and become the cause which decreases the quality of the product. Therefore, to improve the quality of the steel cord product, the research regarding the method of residual stress relaxation is necessary. To evaluate the quality of the drawn wire, it is important to measure the residual stress, because the residual stress decides a variety of the quality level which is demanded in the drawn wire. This study proposed a residual stress relaxation method in the drawn wire using FE analysis. The validity of the analysis results was verified by nanoindentation test.